Gemstone having hearts and arrows cushion-cut

ABSTRACT

A gemstone is configured to yield a hearts and arrows pattern when subjected to light. The gemstone has a length, a width and a height. The gemstone includes a crown portion, a girdle and a pavilion portion. The crown portion has a height of about 10-14.5% of the length of the gemstone and has four sides and four corners where the four corners connect the four sides to each other. The crown portion includes an octagonal table facet, 8 star facets of equal geometry and dimension positioned around the octagonal table facet so as to enclose the octagonal table facet, and other facets. The girdle has a variable thickness extending circumferentially along the gemstone. The pavilion portion has a height of about 45.5-54% of the length of the gemstone and includes 8 main pavilion facets, 16 pavilion half facets positioned around the main pavilion facets, and other facets.

TECHNICAL FIELD

The present disclosure generally relates to a gemstone. More particularly, the present disclosure relates to geometrical and design parameters of the gemstone that will yield a hearts and arrows pattern when the gemstone is viewed in the presence of light.

BACKGROUND

Generally, gemstones either have a square geometry or a rounded geometry. Gemstones having a rounded geometry typically include four curvilinear sides representing the long sides of the diamond which are interconnected to one another by four corners. Such a gemstone also includes a round and a substantially square shaped table facet with the gemstone further possessing a plurality of pavilion facets (of different types) that yield a hearts and arrows pattern when subjected to light. The overall pattern that appears on the gemstone is based on the number of facets and types of facets on the diamond. This pattern generates an aesthetic and brilliance that appeals to the eye.

U.S. Pat. No. 9,456,669 is directed to a diamond which displays a heart and arrows pattern characteristic when subjected to light. More particularly, U.S. Pat. No. 9,456,669 discloses the diamond having rounded geometry with four curvilinear long sides of substantially equal length interconnected by four curvilinear corner sides of equal radius with the four long sides of the diamond comprised of two pairs with each pair having parallel sides and with the diamond having a faceted girdle of varying thickness. In addition, the cushion shaped diamond has four main crown facets two of which lie adjacent each parallel pair, four main crown facets on the corner sides and sixteen crown half facets surrounding the four sides of the diamond. In addition, each main crown facet preferably has 10 girdle facets while each corner side preferably has 7 girdle facets.

SUMMARY

In an aspect of the present disclosure, a gemstone is disclosed. The gemstone is configured to yield a hearts and arrows pattern when subjected to light. The gemstone has a length, a width and a height. The gemstone includes a crown portion, a girdle and a pavilion portion. The crown portion has a height of about 10-14.5% of the length of the gemstone and has four sides and four corners where the four corners connect the four sides to each other. The crown portion includes an octagonal table facet, 8 star facets of equal geometry and dimension positioned around the octagonal table facet so as to enclose the octagonal table facet, 4 first main crown facets of equal geometry and dimension positioned on the four corners of the crown portion such that each first main crown facet is adjacent to two star facets, 4 second main crown facets of equal geometry and dimension positioned on the four sides of the gemstone and 16 crown upper girdle facets positioned around the 4 first main crown facets and 4 second main crown facets so as to form an outer periphery of the crown portion. The girdle has a variable thickness extending circumferentially along the gemstone. The pavilion portion has a height of about 45.5-54% of the length of the gemstone and includes 8 main pavilion facets, 16 pavilion half facets positioned around the main pavilion facets and at least 4 pavilion lower girdle facets positioned adjacent the girdle such that each pavilion lower girdle facet is disposed between the girdle and at most two pavilion half facets.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a side view of an exemplary gemstone, in accordance with an embodiment of the present disclosure;

FIG. 2 illustrates a top view of the gemstone as illustrated in FIG. 1;

FIG. 3 illustrates a bottom view of the gemstone as illustrated in FIG. 1;

FIG. 4 is an illustration of the bottom view of the gemstone when viewed in Hearts & Arrows Scope;

FIG. 5 is an illustration of the top view of the gemstone when viewed in Hearts & Arrows Scope;

FIG. 6 illustrates a side view of an exemplary gemstone, in accordance with an alternate embodiment of the present disclosure;

FIG. 7 illustrates a top view of the gemstone as illustrated in FIG. 6;

FIG. 8 illustrates a bottom view of the gemstone as illustrated in FIG. 6;

FIG. 9 is an illustration of the bottom view of the gemstone as illustrated in FIG. 6, when viewed in Hearts & Arrows Scope;

FIG. 10 is an illustration of the top view of the gemstone as illustrated in FIG. 6, when viewed in Hearts & Arrows Scope;

FIG. 11 illustrates a side view of an exemplary gemstone, in accordance with an alternate embodiment of the present disclosure;

FIG. 12 illustrates a top view of the gemstone as illustrated in FIG. 11;

FIG. 13 illustrates a bottom view of the gemstone as illustrated in FIG. 11;

FIG. 14 is an illustration of the bottom view of the gemstone as illustrated in FIG. 11, when viewed in Hearts & Arrows Scope; and

FIG. 15 is an illustration of the top view of the gemstone as illustrated in FIG. 11, when viewed in Hearts & Arrows Scope.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Referring to FIG. 1, a side view of a gemstone 100 is illustrated. The gemstone 100 has a height ‘h’, a width ‘w’ (extending into the plane of the paper and better illustrated in FIG. 2) and length ‘l’. The gemstone 100 in one embodiment may be made up of silicon carbide (SiC). In another embodiment, the gemstone 100 may be made up of carbon. In various other embodiments, the gemstone 100 may be composed of other known materials in the art. In an embodiment, the gemstone 100 may be a naturally mined diamond. In an alternate embodiment, the gemstone 100 may be a lab-grown diamond. In yet another embodiment, the gemstone 100 may be made up of simulants such as an American glass, Cubic Zirconia (CZ), Moissanite and White Topaz or other such known materials in the art.

The gemstone 100 includes a crown portion 102, a girdle 104 and a pavilion portion 106. The crown portion 102 is a portion of the gemstone 100 that is disposed vertically above the girdle 104. The crown portion 102 has a height ‘h_(c)’ where the magnitude of ‘h_(c)’ lies in the range of 10-14.5% of the length ‘l’ of the gemstone 100. Referring to FIG. 2, the crown portion 102 includes four sides 108, 110, 112 and 114 and four corners 116, 118, 120 and 122. The four corners 116, 118, 120 and 122 connect the four sides to each other.

Each of the four sides 108, 110, 112 and 114 may have a slight curvature but is otherwise substantially straight and equal in length to one another so that the gemstone 100 forms a rounded shape geometry in combination with the four corners 116, 118, 120 and 122. In the embodiment illustrated, the corners 116, 118, 120 and 122 are curvilinear/arcuate in nature such that all the corner have an equal radius. The sides 108 and 112 form a pair which lie in parallel and the sides 110 and 114 form a pair which lie in parallel.

The crown portion 102 further includes a table facet 124, a plurality of star crown facets 126, a plurality of first main crown facets 128, a plurality of second main crown facets 130 and a plurality of upper crown girdle facets 132.

The table facet 124 is the largest facet on the gemstone 100. In the embodiment illustrated, the table facet 124 is an octagonal shaped facet. The table facet 124 includes eight sides. On each of the eight sides of the octagonal facet 124, one star crown facet 126 is positioned such that the star crown facets 126 surround the octagonal table facet 124. More particularly, each side of the octagonal table facet 124 has one star crown facet 126 positioned in such a manner that the eight star facets 126 encircle the octagonal table facet 124. In the embodiment illustrated, the star crown facet 126 is a triangular shaped facet where one side of the triangular shaped crown facet 126 coincides (or abuts) with one side of the octagonal table facet 124.

In the embodiment illustrated, the gemstone 100 includes four first main crown facets 128 of equal geometry and dimension positioned on the corners 116, 118, 120 and 122 of the crown portion 102, as shown in FIG. 2. The first main crown facets 128 may be quadrilateral shaped facets i.e. a face having four sides. The gemstone 100 also has four second main crown facets 130 of equal geometry and dimension positioned on the four sides 108, 110, 112 and 114 of the crown portion 102. The second main crown facets 130 may also be quadrilateral shaped facets i.e. a face having four sides. The four first main crown facets 128 positioned on the four sides 108, 110, 112 and 114 are different in shape from the four second main crown facets 130 on the corners 116, 118, 120 and 122. Each of the first main crown facets 128 and the second main crown facets 130 is positioned in such a manner that each first main crown facets 128 and the second main crown facets 130 is adjacent (i.e. right next to without any other facet in between) to two star facets 126. More particularly, two adjacent sides of each quadrilateral shaped first main crown facets 128 and second main crown facets 130 engage (are in contact with) with two adjacently positioned star facets 126.

Sixteen crown upper girdle facets 132 are positioned around the four first main crown facets 128 and four second main crown facets 130 so as to form an outer periphery of the crown portion 102. More specifically, the sixteen crown upper girdle facets 132 are arranged around the four first main crown facets 128 and four second main crown facets 130 such that the sixteen crown upper girdle facets 132 encircle the four first main crown facets 128 and four second main crown facets 130. Each crown upper girdle facets 132 may have a triangular geometry, as shown in FIG. 2. In the embodiment illustrated in FIG. 1 and FIG. 2, one side of each crown upper girdle facets 132 abuts (coincides) with the girdle 104, another side of each crown upper girdle facet 132 abuts (coincides) with adjacent crown upper girdle facet 132, and a remaining side of each crown upper girdle facets 132 coincides with one side of either the first main crown facet 128 or the second main crown facet 130.

Referring to FIG. 1 and FIG. 3, the pavilion portion 106 of the gemstone 100 shall now be explained. The pavilion portion 106 is the portion of the gemstone 100 that lies vertically below the girdle 104. The pavilion portion 106 has a height ‘h_(p)’ having a magnitude of 45.5-54 percent of the length of the gemstone 100. The pavilion portion 106 includes eight main pavilion facets 140 where each pavilion facet 140 has a geometry like that of a kite. The pavilion facets 140 meet and form a cutlet 142, as shown in FIG. 3.

Around the eight main pavilion facets 140, sixteen pavilion half facets 144 are positioned. Each pavilion half facet 144 has a triangular geometry. The pavilion portion 106 also includes at least four pavilion lower girdle facets 146 positioned adjacent to the girdle 104. The at least four pavilion lower girdle facets 146 are positioned in the pavilion portion 106 such that each pavilion lower girdle facet 146 is disposed between the girdle 104 and at most two pavilion half facets 144.

For example, in an embodiment as illustrated in FIG. 1 and FIG. 3, the gemstone 100 includes four pavilion lower girdle facets 146. The four pavilion lower girdle facets 146 are disposed vertically underneath the midpoint of the sides 108, 110, 112 and 114 of the crown portion 102. Each lower girdle facet 146 is enclosed between two pavilion half facets 144 and the girdle 104. In the embodiment illustrated in FIG. 3, each pavilion lower girdle facet 146 has an isosceles triangular geometry. Each of two equal sides of the isosceles triangular pavilion lower girdle facet 146 is engaging with one pavilion half facet 144. While the remaining one side of the isosceles triangular pavilion lower girdle facet 146 is engaging (abutting) with the girdle 104 at a portion of the girdle 104 having the maximum thickness, as depicted in FIG. 1.

In an alternate embodiment as illustrated in FIG. 6 and FIG. 8, the gemstone 100 includes eight pavilion lower girdle facets 146. The eight pavilion lower girdle facets 146 are disposed at midpoint of the sides 108, 110, 112 and 114. Each lower girdle facet 146 is enclosed by an adjacent lower girdle facet, one pavilion half facet 144 and the girdle 104. In the embodiment illustrated in FIG. 8, each pavilion lower girdle facet 146 has a triangular geometry. One side of the triangular pavilion lower girdle facet 146 is coincident with a side of one pavilion half facet 144 and another side is coincident with a side of the adjacent pavilion lower girdle facet 146 and the remaining side of the triangular pavilion lower girdle facet 146 is coincident with a portion of the girdle 104 having maximum thickness.

Referring to FIG. 11 and FIG. 13, another embodiment, the gemstone 100 includes sixteen pavilion lower girdle facets 146 in such a manner that each pavilion lower girdle facets 146 is disposed between the girdle 104 and one pavilion half facet 144. In the embodiment illustrated in FIG. 11 and FIG. 13, the pavilion lower girdle facets 146 are of two types i.e. first type of pavilion lower girdle facets 146′ and second type of pavilion lower girdle facets 146″. The first type of pavilion lower girdle facets 146′ are triangular and the second type of pavilion lower girdle facets 146″ have a quadrilateral geometry. In the embodiment as illustrated in FIG. 13, the gemstone 100 also includes eight pavilion upper girdle facets 148. The eight pavilion upper girdle facets 148 are positioned underneath the corners 116, 118, 120 and 122 of the crown portion 102, as illustrated in FIG. 11. Each pavilion upper girdle facet 148 has a shape like that of a circular segment i.e. a face generated when end points of an arc are joined by a straight line to form a facet (such as facet 148), as shown in FIG. 11.

Referring to FIG. 11, the positioning of the pavilion upper girdle facets 148, the first type of pavilion lower girdle facets 146′ and the second type of pavilion lower girdle facets 146″ shall now be explained in detail. The second type of pavilion lower girdle facets 146″ are positioned underneath the sides 108, 110, 112 and 114 of the crown portion 102. The second type of pavilion lower girdle facets 146″ that is the quadrilateral shaped facet may include two pairs of opposing sides i.e. a set of vertically opposing sides (a, a) and a set of horizontally opposing sides (b, b). The second type of pavilion lower girdle facets 146″ are positioned on the pavilion portion 106 such that the vertically opposing sides (a, a) of each of the second type of pavilion lower girdle facets 146″ are disposed between the girdle 104 and one pavilion half facet 144. The horizontally opposing sides (b, b) of each second type of pavilion lower girdle facets 146″ are engaging with/coinciding with an adjacent second type of pavilion lower girdle facet 146″ and one first type of pavilion lower girdle facets 146′ respectively, as shown in FIG. 11.

The first type of pavilion lower girdle facets 146′ that are triangular are positioned underneath the corners 116, 118, 120 and 122 of the crown portion 102, as illustrated in FIG. 11. The triangular shaped first type of pavilion lower girdle facets 146′ may include three sides (x, y, z). One side (x) may engage with an adjacent positioned second type of pavilion lower girdle facet 146″. Another side (y) may engage one pavilion half facet 144 lying vertically underneath one corner of the crown portion 102. The remaining side (z) may engage one pavilion upper girdle facet 148.

Each pavilion upper girdle facet 148 is disposed vertically underneath the corners 116, 118, 120 and 122 in such a manner that each circular segment shaped pavilion upper girdle facet 148 is sandwiched (encapsulated) between the girdle 104 and one second type of pavilion lower girdle facet 146″.

The relationship and alignment between adjacent facets and between all crown and pavilion facets are paramount to yield a hearts and arrows pattern. All the pavilion half facets and crown half facets must be perfectly aligned with each other and the pavilion half facets should join each other at the cutlet 142. The unique pattern and the arrangement of the various kind of facets on the pavilion portion 106 and the crown portion 102 provide a brilliance that is more than that of the gemstones known in the art. Further, the gemstone 100 as described herein when visually observed through a conventional Hearts & Arrows Scope in the presence of light forms exactly 8 symmetrical aligned arrows, exactly 8 symmetrical aligned hearts and 8 arrowheads proximal to the center of the gemstone.

INDUSTRIAL APPLICABILITY

In an aspect of the present disclosure, the cushion shaped gemstone 100, as illustrated in FIGS. 1-3, FIGS. 6-8 and FIGS. 11-13, comprises the following facets:

-   -   four first main crown facets 128 of substantially equal geometry         and dimension positioned on the corners 116, 118, 120 and 122 of         the crown portion 102;     -   four second main crown facets 130 of substantially equal         geometry and dimension on the four sides 108, 110, 112 and 114         of the crown portion 102;     -   eight crown star facets 126 surrounding/encircling the table         facet 124;     -   sixteen crown half facets 132 encircling the first main crown         facets 128 and the second main crown facets 130 to form the         outer periphery of the crown portion 102;     -   one octagonal table facet 124;     -   eight main pavilion facets 140;     -   sixteen pavilion half facets 144; and     -   at least four pavilion lower girdle facets 146 on the four sides         108, 110, 112 and 114 of the gemstone 100.

The proportions of the gemstone 100 may be lying in any of the following ranges:

-   -   Height of the gemstone 100: 62%-77% of the length ‘l’ of the         gemstone 100;     -   Height of crown portion 102 i.e. ‘h_(c)’: 10%-14.5% of the         length ‘l’ of the gemstone 100;     -   Height of pavilion portion 104 i.e. ‘h_(p)’: 45.5%-54% of the         length ‘l’ of the gemstone 100;     -   The table size of the octagonal table facet 124 is computed by         dividing a width/length of the octagonal table facet 124 by the         width/length of the gemstone 100. In the embodiment illustrated         in FIG. 1-FIG. 15 the table size is 58.5%-70% of the length ‘l’         or width ‘w’ of the gemstone 100;     -   Girdle thickness: 4.5%-7.5% of the length ‘l’ of the gemstone         100;     -   Length/width ratio: 1.0-1.05 i.e. ratio of ‘l’/‘w’;     -   Crown angle degree range: 30-35 degrees; the crown angle may be         defined as an angular displacement between the crown portion 102         and the girdle 104 (represented by the reference ‘x’ in FIG. 1,         FIG. 6 and FIG. 11); and     -   Pavilion angle degree range: 39-42 degrees; the pavilion angle         may be defined as an angular displacement between the pavilion         portion 106 and the girdle 104 (represented by the reference ‘y’         in FIG. 1, FIG. 6 and FIG. 11).

The shape of the patterns and visual appearance of the diamond as explained above shall now be explained with reference to FIGS. 4-5, FIGS. 9-10 and FIGS. 14-15. The gemstone 100 as illustrated in FIG. 1-FIG. 3 produces a pattern as illustrated in FIG. 4 and FIG. 5 when viewed in the presence of light. Similarly, the gemstone 100 as illustrated in FIG. 6-FIG. 8 and FIG. 11-FIG. 13 produces a pattern as illustrated in FIG. 9 and FIG. 10, and FIG. 14 and FIG. 15 respectively when viewed in the presence of light. The gemstone 100 demonstrated in the embodiments above when visually observed through a conventional scope in the presence of light forms exactly 8 symmetrical aligned arrows when an observer observes the pavilion portion 106 i.e. views a bottom view of the gemstone 100, as illustrated in FIG. 4, FIG. 9 and FIG. 14.

The gemstone 100 demonstrated in the embodiments above when visually observed through a conventional scope in the presence of light forms exactly 8 symmetrical aligned hearts when an observer observes the crown portion 102 i.e. views a top view of the gemstone 100, as illustrated in FIG. 5, FIG. 10 and FIG. 15. Further, the gemstone 100 demonstrated in the embodiments above when visually observed through a conventional scope in the presence of light forms 8 arrowheads proximal to the center of the gemstone 100 when an observer observes the crown portion 102 i.e. views a top view of the gemstone 100, as illustrated in FIG. 5, FIG. 10 and FIG. 15.

While aspects of the present disclosure have seen particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.

LIST OF ELEMENTS

-   100 Gemstone -   102 Crown portion -   104 Girdle -   106 Pavilion portion -   108 Side -   110 Side -   112 Side -   114 Side -   116 Corner -   118 Corner -   120 Corner -   122 Corner -   124 Octagonal table facet -   126 Star facet -   128 First main crown facet -   130 Second main crown facet -   132 Crown upper girdle facet -   140 Main pavilion facet -   142 Cutlet -   144 Pavilion half facet -   146 Pavilion lower girdle facet -   148 Pavilion upper girdle facet 

What is claimed is:
 1. A gemstone configured to yield a hearts and arrows pattern when subjected to light, the gemstone having a length, a width and a height, the gemstone comprising: a crown portion having a height of about 10-14.5% of the length of the gemstone and having four sides and four corners, the corners connect the four sides to each other, the crown portion comprising: an octagonal table facet; 8 star facets of equal geometry and dimension positioned around the octagonal table facet so as to enclose the octagonal table facet; 4 first main crown facets of equal geometry and dimension positioned on the four corners of the crown portion such that each first main crown facet is adjacent to two star facets; 4 second main crown facets of equal geometry and dimension positioned on the four sides of the gemstone; 16 crown upper girdle facets positioned around the 4 first main crown facets and 4 second main crown facets so as to form an outer periphery of the crown portion; a girdle having a variable thickness extending circumferentially along the gemstone; and a pavilion portion having a height of about 45.5-54% of the length of the gemstone, the pavilion portion comprising: 8 main pavilion facets; 16 pavilion half facets positioned around the main pavilion facets; and at least 4 pavilion lower girdle facets positioned adjacent the girdle such that each pavilion lower girdle facet is disposed between the girdle and at most two pavilion half facets.
 2. The gemstone of claim 1, wherein the pavilion portion includes 8 pavilion lower girdle facets.
 3. The gemstone of claim 1, wherein the pavilion portion includes 16 pavilion lower girdle facets.
 4. The gemstone of claim 3, wherein the pavilion portion further comprises 8 pavilion upper girdle facets disposed between the girdle and the pavilion lower girdle facets.
 5. The gemstone of claim 4, wherein the pavilion upper girdle facets are positioned in the pavilion portion at the corners of the gemstone.
 6. The gemstone of claim 1, wherein the 4 pavilion lower girdle facets are positioned adjacent to the girdle at about a mid-point of each side of the gemstone.
 7. The gemstone of claim 1, wherein the 4 pavilion lower girdle facets are positioned adjacent to a portion of the girdle having the maximum thickness.
 8. The gemstone of claim 1, wherein the four corners have an arcuate profile and each corner has an equal radius resulting in the diamond being symmetrical and having a cushion cut configuration.
 9. The gemstone of claim 1, wherein the gemstone when visually observed through a conventional scope in the presence of light forms: exactly 8 symmetrical aligned arrows; exactly 8 symmetrical aligned hearts; and 8 arrowheads proximal to the center of the gemstone.
 10. The gemstone of claim 9, wherein the arrowheads include a pointed portion and an inward portion. 